# CVE-2026-25657: Ericsson Packet Core Gateway denial of service via malformed messages

Source: https://junglewise.ai/threats/cve-2026-25657-ericsson-packet-core-gateway-denial-of-service-via-malformed  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-06-05. Updated: 2026-06-05  
License: CC BY 4.0 with a link back

CVE-2026-25657 · Severity: info · CVSS 7.1 · Published 2026-06-05

The Ericsson Packet Core Gateway, a critical component for managing mobile network traffic, is susceptible to a denial-of-service attack. An attacker can send malformed messages to the system to cause service degradation or crashes, potentially disrupting mobile connectivity for users. While the system recovers once the attack stops, the disruption persists as long as the malicious messages are being sent.

Technologies: [Ericsson Packet Core Gateway](https://junglewise.ai/threats/technologies/packet-core-gateway). Vendors: [Ericsson](https://junglewise.ai/threats/vendors/ericsson).

## Quick answers

**Is CVE-2026-25657 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-25657 being exploited in the wild.

**How severe is CVE-2026-25657?** Informational severity, with a CVSS score of 7.1, published 5 June 2026.

**Which products and versions are affected?** Ericsson Packet Core Gateway prior to 1.30.

**Is there a fix for CVE-2026-25657?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-25657 attacked?** It is attacked from the adjacent network, in a network appliance.

**Am I affected by CVE-2026-25657?** Check whether you run Ericsson Packet Core Gateway at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The vulnerability is classified as Improper Handling of Syntactically Invalid Structure (CWE-228) within the Ericsson Packet Core Gateway (PCG). It is triggered when the system processes specially crafted, syntactically invalid messages, leading to service degradation or software crashes. The attack vector is defined as 'Adjacent,' meaning the attacker must be on the same local network or layer 2 domain as the gateway. No authentication or user interaction is required to exploit this flaw. The impact is a temporary denial of service that persists for the duration of the attack, with the system recovering automatically once the malicious traffic ceases. The issue is resolved in PCG version 1.30.

## Affected products

- Ericsson Packet Core Gateway (PCG) prior to 1.30

## Timeline

- 2026-06-05: disclosed
- 2026-06-05: advisory

## References

- [https://www.ericsson.com/en/about-us/security/psirt/cve-2026-25657](https://www.ericsson.com/en/about-us/security/psirt/cve-2026-25657)

## Related threats

- [Ericsson Packet Core Gateway denial of service via improper handling of missing values](https://junglewise.ai/threats/cve-2026-25659-ericsson-packet-core-gateway-denial-of-service-via-improper)
- [Ericsson Packet Core Gateway improper handling of missing values](https://junglewise.ai/threats/cve-2026-25658-ericsson-packet-core-gateway-improper-handling-of-missing-values)